Supreme Suspensions - Suburban 2500 Shock Extenders Shock Extension Kit High-Strength Carbon Steel (Black) PRO FITMENTS: 2000 - 2013 Chevrolet Suburban 2500 (2WD 4WD). CONTENTS: 2x High-Strength Carbon Steel Shock Extenders, Hardware, Instructions and Pro Pack. INSTALLATION: Easy 'bolt-on' installation takes between 1 - 2 hours. No special tools are required. TECHNICAL NOTES: Maintains factory ride quality. BENEFITS: Reduces over extending pistons so that your factory shocks can be reused without compromising ride quality.